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kelley riley
3,159 PointsWhy is the correct solution correct? It is different from just the die roll from earlier.
During the die roll example, we had: (Math.floor(Math.random() * 6) + 1);
But for our solution it's: document.write(Math.floor(Math.random() * secondNum - firstNum) + firstNum);
Why do we have to subtract the min value from the max value? Why wasn't that necessary in the die roll app?
1 Answer
Steven Parker
231,268 PointsThe die roll is a special case of the more general formula.
Also, you didn't get that formula quite right, its actually this:
Math.floor( Math.random() * (secondNum - firstNum + 1) ) + firstNum
Where firstNum is the lowest number of the range, and secondNum is the highest. This formula works for any range. But if we are simulating a die roll, we know that that firstNum is 1 and secondNum is 6. So we can plug those into the formula and get this:
Math.floor( Math.random() * (6 - 1 + 1) ) + 1
Now since (6 - 1 + 1) is the same as 6, we can simplify it even further to just this:
Math.floor(Math.random() * 6) + 1
...which is exactly what you used for the die roll example.
kelley riley
3,159 Pointskelley riley
3,159 PointsThanks for you correction. I think that's the main issue I was having with this code.